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Related Experiment Video

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Using Micro-Electro-Mechanical Systems MEMS to Develop Diagnostic Tools
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MEMS Microphone Array Sensor for Air-Coupled Impact-Echo.

Robin Groschup1, Christian U Grosse2

  • 1Technische Universität München (TUM), Chair of Non-destructive Testing, Baumbachstr. 7, 81245 Munich, Germany. robin.groschup@tum.de.

Sensors (Basel, Switzerland)
|June 30, 2015
PubMed
Summary
This summary is machine-generated.

A new sensor using an array of micro-electro-mechanical system (MEMS) microphones improves air-coupled Impact-Echo (IE) testing for concrete structures. This cost-effective approach enhances reliability and speed in nondestructive testing.

Keywords:
Impact-EchoMEMS microphonesair coupled sensingarray techniquesnondestructive testing of concrete

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Area of Science:

  • Civil Engineering
  • Materials Science
  • Nondestructive Testing

Background:

  • Impact-Echo (IE) is a key nondestructive testing (NDT) method for concrete structures.
  • Conventional IE sensing often uses single receivers or contact transducers.
  • Limitations include sensitivity to noise and single-point data acquisition.

Purpose of the Study:

  • To introduce a novel sensor concept for air-coupled IE measurements using a micro-electro-mechanical system (MEMS) microphone array.
  • To demonstrate the operational advantages of this array sensor over traditional methods.
  • To validate the sensor's effectiveness through numerical simulations and comparative measurements.

Main Methods:

  • Development of a sensor array utilizing multiple MEMS microphones.
  • Numerical simulations to analyze surface displacement patterns during IE resonance.
  • Comparative experimental measurements using the MEMS array, a conventional accelerometer, and a single microphone.

Main Results:

  • The MEMS microphone array is cost-effective and less sensitive to acoustic noise.
  • Numerical simulations confirmed coherent surface displacements, supporting array-based detection.
  • Comparative tests showed the MEMS array's suitability and advantages for IE data interpretation.

Conclusions:

  • The proposed MEMS microphone array sensor offers significant advantages for air-coupled IE testing.
  • This technology enhances the reliability and efficiency of NDT for plate-like concrete structures.
  • The array configuration facilitates easier identification of IE resonance compared to single-point methods.